||When using the MDRZTAB reference file for a single image, the AstroDrizzle TEAL GUI will crash because driz_sep_kernel value was INDEF, which was an unacceptable input value. This update changes driz_sep_kernel for N=1 images from INDEF to minmed, which prevents TEAL from crashing.
||These files were generated following the ACS WFC anneal on June 26, 2019, and should be used to calibrate ACS WFC observations taken between May 31, 2019 and June 26, 2019.
||The reason is that new STIS phottab and ACS WFC post flash reference files was delivered.
||TDCTAB is used to derive a factor that gets multiplied to the NUVMAMA dark reference file before the dark subtraction. We found that the older TDCTAB is not scaling the dark correctly for data taken after Jan 1, 2014, so we added 2 new rows to the TDCTAB to correctly scale the dark.